hello. i have a problem. my diploma work concerns writing own CMS. i have not enough knowelego about it. can You suggest me some book where i can find how to build own CMS from basics ??

i wonder whether to buy this book:

"Build Your Own Database Driven Website Using PHP and MySQL, Third Edition"
By Kevin Yank
Third Edition October 2004
Publisher: SitePoint

, if only i find it in Poland. would it be helpful for me, or should I buy anything else ?? maybe You know some tutorial or anything else??

thanks for answer in advance,
Patrick form Poland